Filtering device



March 6, 1945. L. v. LUCIA FILTERING DE ICE Filed Oct. 5. 1941 INVENTOR.

Patented Mar. 6, 1945 L FILTERING DEVICE Louis V. Lucia, West liar tford, Conn, assignor to The Silex Company, Hartford, Conn., a corporation of Connecticut Application October s, 1941, Serial No. 413,471 4 Claims. (01. 210-162) This invention relates to cloth-less filters as are more particularly intended for use in coffee makers of the vacuum type.

In such coiTee makers it is highly desirable that the coffee brew be filtered in a reasonably short time from the coffee grounds in the upper bowl of the coffee maker so as to prevent the extraction of undesirable elements from the cofiee. 'At the same time, it is also desirable to properly filter the grounds from the brew by preventing them from passing past the filtering element into the mouth of the stem and thereby retard the filtering process.

s to be understood It i filtration, it is only important that the filtering The object of the invention therefore is to provide a filtering device which is highly efllcient in its operation and which will reduce the length of time required for filtering.

A further object is to provide for a more positive positioning of the filter in the coffee maker so as to insure proper filtration.

Further objects of the invention will be more clearly understood from the following description and from the accompanying drawing in which:

'Fig. 1 is a side view of my improved filter showed to lit in the mouth ing the same in position in the upper bowl or a cofiee maker which is illustrated in central vertical section.

Fig. 2 is a bottom view of the filter in elevation.

Fig. 3 is a view of the filter in central vertical section. I

Fig. 4 is a plan view in section on line 4-4 of the drawing, the numeral 5 bowl such as used in coffee As illustrated in denotes an upper makers or the vacuum typeand which has a depending stem 6 which fits withinth'e neck a lower bowl as commonly known.

The present invention pertains to a filter which prererably consists or a member I that is adaptnlustrated in the drawing. The said member has an upwardly flared cup-shaped portion 8 substantially closing the mouth of the stem 6 and spaced prererrea for the height of these ribs. This therefore leaves an equal clearance between the relative surfaces of the filter and the mouth of the stem which provides filtering space area line of filtration which assures proper filtration with maximum speed.

In the r'orm shown in the drawing, the filter is provided with a threaded portion l0' adapted to receive the end of a coil spring II by simply stem 6 for resiliently retaining the filter in seated position within the mouth of the stem.

While I have illustrated anddescribed one emparting from the scope thereof as set forth in the I appended claims.

of the stem 6 as clearly a substantially unbroken I claim: 1. A filter oi the character described comprising a member having a filtering head, a threaded portion adjacent to said head, 'a spring securedto said threaded portion for retaining said head against the mouth of a hollow stem in an upper bowl 01' a coflee maker, a stem depending irom said threaded portion into said spring, and means for securing said sprin8 to said hollow stem.

portion, an enlarged portion on said stem adjacent to said filtering portion and a spring surrounding said stem; said enlarged portion having a thread thereon for receiving one end 0! said spring; the bottom of said thread running from the surface of said stem to a larger diameter for expanding the end of the spring as it is threaded thereto and thereby preventing unthreading of said spring from said threaded portion, and anchoring means at the opposite end of said spring.

4. A filter oi! the character described comprising a member having a filtering head with a portion depending therefrom, said portion having a spiral groove running upwardly thereon, a spiral spring threaded to said groove, and means for securing said spring to a hollow stem in an upper bowl or a coffee, maker for retaining said head against the mouth or said hollow stem.

LOUIS V. LUCIA. 

